90=10(r+7)

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Solution for 90=10(r+7) equation:


Simplifying
90 = 10(r + 7)

Reorder the terms:
90 = 10(7 + r)
90 = (7 * 10 + r * 10)
90 = (70 + 10r)

Solving
90 = 70 + 10r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-10r' to each side of the equation.
90 + -10r = 70 + 10r + -10r

Combine like terms: 10r + -10r = 0
90 + -10r = 70 + 0
90 + -10r = 70

Add '-90' to each side of the equation.
90 + -90 + -10r = 70 + -90

Combine like terms: 90 + -90 = 0
0 + -10r = 70 + -90
-10r = 70 + -90

Combine like terms: 70 + -90 = -20
-10r = -20

Divide each side by '-10'.
r = 2

Simplifying
r = 2

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